Format: APS-C (crop)
Type: Zoom lens
Focusing: Auto Focus (AF)
Lens mounts: Canon EF, EF-S, Sony A / Minolta A, Nikon F (FX, DX), Pentax K, Sigma SA
First year of production: 2009
Optical design: 13 elements in 10 groups (4 AS, 2 SLD, 1 ELD)
Features: Ultra-Sonic Motor | |
Additional information:
The Sigma 10-20 mm f/ 3.5 EX DC HSM
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Diagonal angle of view 102.4º- 63.8º (1.7x Sigma SD)
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Diagonal angle of view 106.6°- 67.7° (1.6х Canon EFs)
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Diagonal angle of view 109.7°- 70.7° (1.5x Nikon DX)
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Diameter 87.3 mm
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Max. magnification 1:6.6
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Angle of focusing ring rotation 130-140°
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A hood (petal, bayonet, LH873-01) and carrying case are included with the lens.
The Sigma 10-20mm F3.5 EX DC HSMis a superwide-angle 2x zoom with a constant maximum aperture throughout the entire zoom range designed for DSLR APS-C cameras and providing its owners with a very popular range of focal lengths of 15-30 mm.
The optical scheme of the Sigma 10-20 mm f/ 3.5 EX DC HSM includes four aspherical elements (two hybrid and two molded ) for correction of distortion and astigmatism, two SLD elements and one ELD element for correction of chromatic aberration. The super multi-coating of optic elements reduces flare and halation, and increases contrast.
The Hyper-Sonic Motor of the AF drive provides noiseless and high-speed focusing and the possibility of constant manual focusing without switching to the manual mode. The autofocus does not function on the Pentax * IST and K100D cameras, which do not support the HSM.
The system of internal focusing eliminates the front lens rotation and provides convenient use of a petal hood and polarized filters, as well as focusing at minimum distance 24 cm throughout the entire zoom range.
The size of the Sigma 10-20 mm f/ 3 EX DC OS HSM changes while zooming in. It has smallest size at the focal distance of 15 mm, it is a bit longer at the focal distance of 20 mm, at the focal distance of 10 mm the lens reaches its maximum, becoming just 5 mm longer.
The Sigma 10-20 mm f/ 3.5 EX DC HSM cons:
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very good mechanical build,
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superb image quality at the center at all focal lengths,
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very good image quality on the edges,
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well controlled astigmatism,
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slight distortion at long focal lengths,
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resistant to back light,
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fast, quiet and precise autofocus,
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3-5 years of warranty.
The Sigma 10-20 mm f/ 3.5 EX DC HSM cons:
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very large filter diameter,
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considerable chromatic aberration in the middle of focal lengths,
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fairly high distortion at a close focal length,
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corners at a close focal length,
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considerable level of vignetting,
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visible coma.
Links to online resources:
PDF Files:
Posted by: dv Date of publication: 28.10.2010
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